I’m not sure what the collab on this ring is, as there are no details on the  Banana Republic site. Interestingly, the brand’s site won’t load for me but there is an old page on the BR site that gives more information.

This ring is made of silver plated bronze (there is also a gold plated version). At the time of writing it was on sale for USD$40 from $70 (the gold plated version is full price).